The theory and practice of surveying. Designed for the use of surveyors and engineers generally, but especially for the use of students in engineering (1886)
Johnson, J. B. (John Butler), 1850-1902 · New York, J. Wiley & sons · leaf 174
he mirrors /and c in succession, they havingan angle of 45° with each other. By this means a line maybelocated at right angles to a given line at a given point, or apoint in a given line may be found in the perpendicular to thisline from a given point. THE PLANIMETER. 143. The Planimeter is an…
Surveying
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